Package No. 5.2: Construction And Installation Of Transformer Stations: Thuong Tin 500Kv Substation, Dong Anh 500Kv Substation, Pho Noi 500Kv Substation, Pho Cao 220Kv Substation, Hai Duong 2 220Kv Substation, Vat Cach 220Kv Substation